Displaying 5 results of Zilpaterol Stable Isotopes Zilpaterol is a beta-agonist drug used in animal agriculture to promote growth and increase lean muscle mass in cattle. Stable isotopes of zilpaterol are non-radioactive forms of the drug that are used for research and analytical purposes. These isotopes have the same chemical properties as the standard zilpaterol molecule, but have a different atomic weight, allowing for precise measurements and tracking of the drug in biological systems.